'bullpen' definitions:

Definition of 'bullpen'

(from WordNet)
noun
A place on a baseball field where relief pitchers can warm up during a game
noun
A large cell where prisoners (people awaiting trial or sentence or refugees or illegal immigrants) are confined together temporarily [syn: bullpen, detention cell, detention centre]

Definition of 'bullpen'

From: GCIDE
  • bullpen \bull"pen`\ (b[.u]l"p[e^]n`), n. (Baseball)
  • 1. an open area in a baseball stadium, off the playing field, where pitchers may warm up by throwing a number of trial pitches before playing. [PJC]
  • 2. [collective] the relief pitchers on a baseball team. Contrasted with starters. [PJC]